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"For airborne viruses, it is incredibly important to ventilate, since ventilation becomes your main means of control besides isolating the affected person," he says.

Airborne viruses are transmitted by tiny droplets of nuclei that hang around in the air for as long as five hours.

Dr Gendreau says these droplets can't in fact reach you if the air con is on, because a barrier has been formed around you which prevents this.

Many of us may attribute air con to the spread of germs - but this is incorrect. He adds, "the air that you’re typically breathing and exposed to is usually anywhere from two to five rows surrounding your seat.